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Synthesis And Characterization Of Two Photon Fluorescent Chromophores For Biological Imaging Ms
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Book Synopsis Synthesis and Characterization of Two-photon Fluorescent Chromophores for Biological Imaging (MS). by : Judith M. Lavin
Download or read book Synthesis and Characterization of Two-photon Fluorescent Chromophores for Biological Imaging (MS). written by Judith M. Lavin and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design, Synthesis and Characterization of New Two-photon Absorbing (2PA) Fluorescent Dyes and Bioconjugates, and Their Applications in Bioimaging by : Carolina D. Andrade
Download or read book Design, Synthesis and Characterization of New Two-photon Absorbing (2PA) Fluorescent Dyes and Bioconjugates, and Their Applications in Bioimaging written by Carolina D. Andrade and published by . This book was released on 2010 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of new multiphoton absorbing materials has attracted the attention of researchers for the last two decades. The advantages that multiphoton absorbing materials offer, versus their one-photon absorbing counterparts, rely on the nature of the nonlinearity of the absorption process, where two photons are absorbed simultaneously offering increased 3D resolution, deeper penetration, and less photobleaching and photodamage as a result of a more confined excitation. The applications of efficient two-photon absorbing materials have been extensively expanding into the fields of photodynamic therapy, microscopy, and optical data storage. One of the fields where an increased interest in multiphoton absorbing materials has been most evident is in bioimaging, in particular, when different cellular processes and organelles need to be studied by fluorescence microscopy. The goal of this research was to develop efficient two-photon absorption (2PA) compounds to be used in fluorescence bioimaging, meaning that such compounds need to posses good optical properties, such as high fluorescence quantum yield, 2PA cross section, and photostability. In the first chapter of this dissertation, we describe the synthesis and structural characterization of a new series of fluorescent donor-acceptor and acceptor-acceptor molecules based on the fluorenyl ring system that incorporated functionalities such as alkynes and thiophene rings, through efficient Pd-catalyzed Sonogashira and Stille coupling reactions, in order to increase the length of the conjugation in our systems. These new molecules proved to have high two-photon absorption (2PA), and the effect of these functionalities on their 2PA cross section values was evaluated. Finally, their use in two-photon fluorescence microscopy (2PFM) imaging was demonstrated. One of the limitations of the compounds described in Chapter 1 was their poor water solubility; this issue was addressed in Chapter 2. The use of micelles in drug delivery has been shown to be an area of increasing interest over the last decade. In the bioimaging field, it is key to have dye molecules with a high degree of water solubility to enable cells to uptake the dye. By enclosing a hydrophobic dye in Pluronic® F-127 micelles, we developed a system that facilitates the use of 2PA molecules (typically hydrophobic) in biological systems for nonlinear biophotonic applications, specifically to image the lysosomes. Furthermore, we report in this chapter the efficient microwave-assisted synthesis of the dye used in this study. In addition, linear photophysical and photochemical parameters, two-photon absorption (2PA), and superfluorescence properties of the dye studied in Chapter 2, were investigated in Chapter 3. The steady-state absorption, fluorescence, and excitation anisotropy spectra of this dye were measured in several organic solvents and aqueous media. In Chapter 4, we describe the preparation and the use of an efficient and novel two-photon absorbing fluorescent probe conjugated to an antibody that confers selectivity towards the vascular endothelial growth factor receptor 2 (VEGFR-2) in porcine aortic endothelial cells that express this receptor (PAE-KDR). It is known that this receptor is overexpressed in certain cancer processes. Thus, targeting of this receptor will be useful to image the tumor vasculature. It was observed that when the dye was incubated with cells that do not express the receptor, no effective binding between the bioconjugate and the cells took place, resulting in very poor, nonspecific fluorescence images by both one and two-photon excitation. On the other hand, when the dye was incubated with cells that expressed VEGFR-2, efficient imaging of the cells was obtained, even at very low concentrations (0.4[micrometer]). Moreover, incubation of the bioconjugate with tissue facilitated successful imaging of vasculature in mouse embryonic tissue.
Book Synopsis Synthesis, Characterization, and Evaluation of New Reactive Two-photon Absorbing Dyes for Two-photon Excited Fluorescence Imaging Applications by : Katherine J. Schafer
Download or read book Synthesis, Characterization, and Evaluation of New Reactive Two-photon Absorbing Dyes for Two-photon Excited Fluorescence Imaging Applications written by Katherine J. Schafer and published by . This book was released on 2005 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent, cooperative advances in chemistry, biology, computing, photophysics, optics, and microelectronics have resulted in extraordinary developments in the biological sciences, resulting in the emergence of a novel area termed ‘biophotonics’. The integrative and interdisciplinary nature of biophotonics cuts across virtually all disciplines, extending the frontiers of basic cellular, molecular, and biology research through the clinical and pharmaceutical industries. This holds true for the development and application of the novel imaging modality utilizing multiphoton absorption and its extraordinary contribution to recent advances in bioimaging. Intimately involved in the revolution of nonlinear bioimaging has been the development of optical probes for probing biological function and activity.
Book Synopsis Synthesis of Fluorene-based Derivatives, Characterization of Optical Properties and Their Applications in Two-photon Fluorescence Imaging and Photocatalysis by : Grace Wairimu Githaiga
Download or read book Synthesis of Fluorene-based Derivatives, Characterization of Optical Properties and Their Applications in Two-photon Fluorescence Imaging and Photocatalysis written by Grace Wairimu Githaiga and published by . This book was released on 2015 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: The two-photon absorption (2PA) phenomenon has attracted attention from various fields ranging from chemistry and biology to optics and engineering. Two of the common NLO applications in which organic materials have been used are three-dimensional (3D) fluorescence imaging and optical power limiting. Two-photon absorbing materials are, therefore, in great demand to meet the needs of emerging technologies. Organic molecules show great promise to meet this need as they can be customized through molecular engineering, and as the development of two-photon materials that suit practical application intensifies, so does research to meet this need. However, there remains some uncertainty in the particulars of design criteria for molecules with large 2PA cross sections at desired wavelengths, as such research to understand structure-property relationships is matter of significant importance. As a result, the full potential of 2PA materials has not been fully exploited. Several strategies to enhance the magnitude and tune the wavelength of 2PA have been reported for [pi]conjugated organic molecules. On this account, we have designed novel fluorophores using the fluorene moiety and modified it to tune the properties of the compounds.
Download or read book Master's Theses Directories written by and published by . This book was released on 2004 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Book Synopsis Fluorescent Imaging in Medicinal Chemistry by : Zhen Cheng
Download or read book Fluorescent Imaging in Medicinal Chemistry written by Zhen Cheng and published by Springer Nature. This book was released on 2020-05-28 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the most recent developments of fluorescent imaging techniques for medicinal chemistry research and biomedical applications, including cell imaging, in vitro diagnosis and in vivo imaging. Fluorescent imaging techniques play an important role in basic research, drug discovery and clinical translation. They have great impact to many fields including chemical biology, cell biology, medical imaging, cancer diagnosis and treatment, pharmaceutical science, among others, and they have facilitated our understanding of diseases and helped to develop many novel powerful tools for imaging and treatment of diseases. This book will appeal to scientists from numerous fields such as chemistry, pharmaceutical science, biology, materials science, and medicine, and it will serve as a very useful and handy resource for readers with different levels of scientific knowledge, ranging from entry level to professional level.
Download or read book Imaging Neurons written by Rafael Yuste and published by . This book was released on 2000 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past decade, advances in microscopy have been coupled with new methods of culturing and labeling cells to generate the new science of imaging. Imaging technologies allow investigators to look directly inside living cells and probe their form and function in unprecedented detail. This approach is revolutionizing many aspects of biomedical research, particularly neuroscience, in which visual techniques have traditionally been so important. This manual is the first comprehensive description of the range of imaging technologies being applied to living cells. With its origins in a laboratory course taught at Cold Spring Harbor Laboratory by the editors and contributors, it is packed with the kind of technical detail and practical advice that are essential for success, yet seldom found in the research literature. It covers both established methods and cutting-edge techniques such as multiphoton excitation microscopy and imaging of genetically engineered probes. Although it is neurons to which these technologies are most commonly applied, the methods described are readily adaptable to many other cell types. This book will therefore be an invaluable aid to investigators in cell and developmental biology and immunology as well as neuroscience who wish to take advantage of the extraordinary insights into cellular function offered by imaging technologies.
Book Synopsis Two-photon Chromophore-polymer Conjugates Grafted Onto Gold Nanoparticles as Fluorescent Probes for Bioimaging and Photodynamic Therapy Applications by : Cristina Cepraga
Download or read book Two-photon Chromophore-polymer Conjugates Grafted Onto Gold Nanoparticles as Fluorescent Probes for Bioimaging and Photodynamic Therapy Applications written by Cristina Cepraga and published by . This book was released on 2020 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photodynamic therapy (PDT) is an alternative treatment of cancer requiring the use of chromophore molecules (photosensitizers), which can induce cell death after light excitation. Gold nanoparticles (AuNP), exhibiting localized Surface Plasmon Resonance, can enhance the photophysical response of chromophores located in their vicinity, and thus improve their therapeutic action. Moreover, the use of highly localized two-photon chromophores (photosensitizers and fluorophores), capable to undergo a localized excitation by light in the Near InfraRed region, should increase the penetration depth into tissues, thus improve the treatment efficiency (by PDT) and the imaging (by fluorescence microscopy) of cancer tissues.In this work, we describe the elaboration of water-soluble hybrid nano-objects for PDT and fluorescence bioimaging applications, composed of two-photon chromophore-polymer conjugates grafted onto gold nanoparticles. In order to obtain these nano-objects we follow a multistep strategy: i) the synthesis of a well-defined water-soluble chromophore-polymer conjugates; ii) the end-group oriented grafting of chromophore-polymer conjugates onto 20 nm AuNP. The coupling of hydrophobic two-photon chromophores on linear water-soluble copolymer chains (poly(N-acryloylmorpholine-co-N-acryloxysuccinimide)), obtained by controlled/living RAFT polymerization, resulted in well-defined water-soluble chromophore-polymer conjugates, with different polymer lengths (2 000 g.mol-1
Book Synopsis Optimization of Two-photon Excited Fluorescence for Volumetric Imaging by : Pubudu Thilanka Galwaduge
Download or read book Optimization of Two-photon Excited Fluorescence for Volumetric Imaging written by Pubudu Thilanka Galwaduge and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-photon microscopy is often used in biological imaging due to its optical sectioning and depth penetration capabilities. These characteristics have made two-photon microscopy especially useful for neurobiological studies where imaging a volume at single cell resolution is typically required. This dissertation focuses on the optimization of two-photon excited fluorescence for volumetric imaging of biological samples, with special attention to imaging the mouse brain. Chapter 2 studies wavefront manipulation as a way of optimizing two-photon excited fluorescence. We show, through numerical simulations and experiments, that the magnitude of the two-photon fluorescence signal originating from cell-sized objects can be used as a metric of beam quality. We also show that the cranial window used in mouse experiment is a major source of aberrations, which can readily be represented in the Zernike basis. Finally, we implement a modal wavefront optimization scheme that optimizes the wavefront based entirely on the magnitude of the fluorescence.
Book Synopsis Self-assembly and Photophysics of Selected Organic Materials and Two-photon Bioimaging with Profluorescent Nitroxides, Polyelectrolyte Nanoparticles, and Squaraine Probes by : Hyo-Yang Ahn
Download or read book Self-assembly and Photophysics of Selected Organic Materials and Two-photon Bioimaging with Profluorescent Nitroxides, Polyelectrolyte Nanoparticles, and Squaraine Probes written by Hyo-Yang Ahn and published by . This book was released on 2011 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-photon absorption and upconverted fluorescence has been utilized in a variety of applications in pure science and engineering. Multiphoton-based techniques were used in this research in order to understand photophysical and chemical characteristics of several fluorescent dyes and to demonstrate some of their key applications. Two-photon fluorescence microscopy (2PFM) has become a powerful technique in bio-photonics for non-invasive imaging in the near-infrared (NIR) region (700~1000 nm) that often results in less photobleaching. In Chapter 1, there is a brief introduction to fluorescence, examples of fluorescence materials, and a discussion of the advantages of two-photon absorption. 2PFM imaging was utilized in Chapters 2 to 4 for various applications. In Chapter 2, a new squaraine dye is introduced and its linear and nonlinear photophysical properties are characterized. This compound has very high two-photon absorption (2PA) cross sections and high photostability both in an organic solvent and when encapsulated in micelles. Based on these properties, this dye was demonstrated as a near-infrared (NIR) probe in in vitro 2PFM imaging with excitation over 800 nm wavelength. In Chapter 3, new profluorescent nitroxides are introduced. Nitroxide radicals are utilized for electron paramagnetic resonance (EPR) spectroscopy and in biological systems as some are known, in some manner, to mimic the behavior of superoxide dismutase (SOD) that detoxifies or mitigates oxidative stress by trapping free radicals. Here, two profluorescent nitroxides investigated for use as a two-photon fluorescent oxidative stress indicator in in vitro two-photon fluorescence microscopy (2PFM) imaging. In Chapter 4, two-photon excited (2PE) fluorescence of a conjugated polyelectrolyte (CPE), PPESO3, was studied in methanol and in water. The results of CPE quenching studies were comparable under both one-photon excitation conditions and two-photon excitation. CPE coated silica nanoparticles were incubated in HeLa cells and 2PFM imaging was demonstrated for this new class of fluorescent probe. Supramolecular structures based on organized assemblies/aggregation of chromophores have attracted widespread interest as molecular devices with potential applications in molecular electronics, artificial light harvesting, and pharmacology. In Chapter 5, J-aggregate formation was investigated for two porphyrin-based dyes, 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (TPPS, 4) and an amino tris-sulfonate analog (5) in water via UV-vis, fluorescence, and lifetime decay studies. The effect of aggregation on two-photon absorption properties was also investigated. A functionalized norbornene-based homopolymer, synthesized by the ring opening metathesis polymerization technique was used as a J-aggregation enhancement template and had a role of polymer-templating to facilitate porphyrin aggregation and modulate 2PA. In Chapter 6, squaraine dye aggregates templated with single wall carbon nanotubes (SWCNTs) that were atomically clean were studied by using optical absorption spectroscopy, atomic force microscopy (AFM), and photoconductivity measurements. SWCNTs selectively promote the formation of squaraine dye aggregates with a head-to-head stacking arrangement, and these dye aggregates effectively photosensitize SWCNTs, demonstrating that this novel approach can yield highly photosensitized devices.
Book Synopsis Two-photon excitation fluorescence lifetime imaging by : Jurrien Marius Vroom
Download or read book Two-photon excitation fluorescence lifetime imaging written by Jurrien Marius Vroom and published by . This book was released on 1998 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterization of Biological Chromophores Using Fast Electrophoretic Analyses and Multiphoton-exited Fluorescence by : Mary Jane Sia Gordon
Download or read book Characterization of Biological Chromophores Using Fast Electrophoretic Analyses and Multiphoton-exited Fluorescence written by Mary Jane Sia Gordon and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design, Synthesis, and Characterization of Mechanosensitive Dual Fluorescent Dyes as Potential Probes for Biological Applications by : Susantha Ganegamage
Download or read book Design, Synthesis, and Characterization of Mechanosensitive Dual Fluorescent Dyes as Potential Probes for Biological Applications written by Susantha Ganegamage and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chapter 3 of this dissertation explores a hypothesis that leverages the seesaw photophysical model for N-aryl (2,3- and 1,8-) naphthalimides. The Heagy group initially developed this model to understand the dual fluorescence effect concerning the electron donor or electron-withdrawing substituents. This study envisions the design and synthesis of novel dual fluorescence molecules for a new class of N-aryl-phenanthridinone dyes. The applied photophysical model further investigates these dyes with a substitution pattern opposite naphthalimide systems. Interestingly, predictive computational modeling shows that the substituent pattern, used previously for 2,3-naphthalimides, relies on these groups getting placed on rings in opposite positions for N-aryl-phenanthridinones. Chapter 4, provides an overall conclusion of the and future directions for both parts of the research. In chapter 5, a complete description of experimental data is provided for the characterization of all the dye systems presented. This data includes a detailed synthesis procedure, characterization, purity analysis by HPLC, absorptivity calculation, fluorescence lifetime measurements, quantum yield determination, biological evaluation and fluorescence titration.
Book Synopsis A Complete Analysis of Two-photon Induced Fluorescence Anisotropy Applied to Some Biological and Biologically Relevant Molecules by : Tawfik Mohammed Ali al- Hadhuri
Download or read book A Complete Analysis of Two-photon Induced Fluorescence Anisotropy Applied to Some Biological and Biologically Relevant Molecules written by Tawfik Mohammed Ali al- Hadhuri and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Fluorescent Peptide-dendron Hybrids by : Deirdre Reneé Zwilling
Download or read book Synthesis and Characterization of Fluorescent Peptide-dendron Hybrids written by Deirdre Reneé Zwilling and published by . This book was released on 2009 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fluorescent Analogs of Biomolecular Building Blocks by : Marcus Wilhelmsson
Download or read book Fluorescent Analogs of Biomolecular Building Blocks written by Marcus Wilhelmsson and published by John Wiley & Sons. This book was released on 2016-04-04 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluorescent Analogs of Biomolecular Building Blocks focuses on the design of fluorescent probes for the four major families of macromolecular building blocks. Compiling the expertise of multiple authors, this book moves from introductory chapters to an exploration of the design, synthesis, and implementation of new fluorescent analogues of biomolecular building blocks, including examples of small-molecule fluorophores and sensors that are part of biomolecular assemblies.
Book Synopsis Two-Photon Excitation, Fluorescence Microscopy, and Quantitative Measurement of Two-Photon Absorption Cross Sections by :
Download or read book Two-Photon Excitation, Fluorescence Microscopy, and Quantitative Measurement of Two-Photon Absorption Cross Sections written by and published by . This book was released on 2017 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: As optical microscopy techniques continue to improve, most notably the development of super-resolution optical microscopy which garnered the Nobel Prize in Chemistry in 2014, renewed emphasis has been placed on the development and use of fluorescence microscopy techniques. Of particular note is a renewed interest in multiphoton excitation due to a number of inherent properties of the technique including simplified optical filtering, increased sample penetration, and inherently confocal operation. With this renewed interest in multiphoton fluorescence microscopy, comes an increased demand for robust non-linear fluorescent markers, and characterization of the associated tool set. These factors have led to an experimental setup to allow a systematized approach for identifying and characterizing properties of fluorescent probes in the hopes that the tool set will provide researchers with additional information to guide their efforts in developing novel fluorophores suitable for use in advanced optical microscopy techniques as well as identifying trends for their synthesis. Hardware was setup around a software control system previously developed [1]. Three experimental tool sets were set up, characterized, and applied over the course of this work. These tools include scanning multiphoton fluorescence microscope with single molecule sensitivity, an interferometric autocorrelator for precise determination of the bandwidth and pulse width of the ultrafast Titanium Sapphire excitation source, and a simplified fluorescence microscope for the measurement of two-photon absorption cross sections. Resulting values for two-photon absorption cross sections and two-photon absorption action cross sections for two standardized fluorophores, four commercially available fluorophores, and ten novel fluorophores are presented as well as absorption and emission spectra.
